Bending machine



GI H. ZIMMER. BENDING MACHINE. APPLICATION FILED FEB- 23, I921.

JIASQML Patented Nov. 7, 192;.

3 SHEETS-SHEEI I.

G. H. ZIMMER.

BENDING MACHINE. APPLICATION FILED FEB. 23. 1921.

Patented Nov. 7,

3 SHEETSSHEET 2.

4 FOP/V5715.

G. H. ZIMMER. BENDING MACHINE. APPLICATION FILED FEB. 23. 1921.

. v, W Mp. 2. 7 N 93 I N m. W M a? H M Patented Nov. 7, 1922.

' MTE si res nter GUsrav 1a. znctrtnaon.nurraro nnw Yonn, ASSIGNOR TO UrrALo FORGE ooMPeNY, or :eUEFALo, new YORK.

Bnnnrne lvrnonrnn.

- V Application filed February 28, 1921. Serial No. 447,053.

To *al'tj ma ma may concern.

Be' 'it" known that GUSTAV H: ZIMMER, a

citizenibfthe United States, residing at Buffallo, in the county of Erie and State of New York, have invented a new and; useful Improvement in Bendin Machines, of which the following is a specification.

This invention relates to metal bending or shaping machines and more particularlyto metal bar or angle iron bending machines of that type in which the bars are bent by being passed between rolls, the relative disposition of which determines the curvatures given to the bars.

Machines of this typeare necessarily of relatively great weight and of sturdy construction by reason of which fact they are practically sold by weight.- It is desirable, therefore, that themachines have but few machined parts and no complicated parts or mechanism whatsover. It is also essential, in view of the great pressures exerted on the parts of the machines that the adjustable and-movable parts be so made and so associated that they will not be subjected to de-' structive strain. 1

The objects of the invention are to provide. a bending machine of simple but strong construction and ofcompact organization: and which consists of relatively few parts;

. also to provide a machine which is readily and conveniently adjustable to permit of the shaping of a variety'of different curvesand operations upon bars of different sizes and shapes, but in which all of the bending rolls, are positively driven at. all times; also to provide simple but efiicient means for pre venting distortion of the variousshapes as they pass through the machine; and to improve the driving connections-for the rolls of a machine of this type. Further objects are to improve metal bending machines in the other respects hereinafter described and claimed. v

In the accompanying drawings Figs. 1 and 2 are opposite end elevations of a machine embodying the invention.

Fig. 3 is a side elevation thereof;

Fig. 3 is a side elevation thereof.

Fig. 4 is an end view of the bendingrolls and mountings therefor, one of the eccentric guide rolls being removed.

Fig; 5 is a sectional elevationof a portion of the swinging frame lf orthe adjustable bendingroll;

Fig. 6 is a sectional detail through one of the eccentric guidev rollers and. mounting therefor. i i l Fig.7 is a plan view of the machine.

A designates a base for the machine, and B a stationary framework for supporting the bending rolls and driving means. C and D designate oppositely driven pulleys adapted to be connected by a clutch it to a maindrive shaft.10 for driving said shaft in one or another direction. The .bending rolls, shown at F, G and H, are alldrivenfrom this drive shaft, vprefeiablyby the following gearing: The shaft 10 carries adriving pinion 11 which is in mesh withanddrives a gear 12 loosely mounted one shaft 13 journalled in the stationary. frame. 14: designates a pinionloosely.mounted on shaft'13 and fixed to gear. 12,- which pinion meshes with a gear 15 fixed to a shaftv 16. Shaft16 also carries a fixed pinion 17- which meshes with and drives a pinion 18 lined to a shaft 19 Pinion .18 drives an idler pinion 20 mounted on a shaft 21. The shafts 16, 19 and2l are suitably journalled in the stationary frame.v The idler pinion 20 in turn drives a pinion 22 fixed to shaft13.

Shafts 13 and 19 beaitat theirv outer ends the two-part bendingrollsF and (in. These two-partrolls are alike, each comprising an adjustable roll 23 and a fixed roll 2 1. When the machine is used for. bending angle irons, the rolls, 23 and 2 1 are adaptedto be spaced apart providing a slot 25 to receive afiange or leg of the angle iron, and for the purpose of providing for adjustments of the. effective width of the slot 25 betweenthese members the adjustable rolls 23 are slidably keyed on their respective shaftsandare heldin position thereon by washers 26 and 27.

For the purpose of-permittingquick and easy adjustment of the .rolls, to obviatethe necessity for. any complicated .meohanism forv adjusting the. rolls to regulate the curvature to which the bars are to be rolled, and to avoid weakening the base or stationary frame, the adjustable roll of the machine is mounted in a movable or swinging frame positioned above the stationary rolls. 'By reason of this construction, the adjustable parts are most readily accessible for replace ment or repair and by swinging the movable frame out of the way, the relatively fixed rolls and parts may be inspected and are mantling the machine. In the preferred embodiment illustrated, H designates a movable roll which is adapted to be moved towards or from the two stationary rolls to vary the curvature to which'the' bar is to be rolled. the same two-part construction described for the stationary rolls and is held in place on its shaft 23 in the manner described for the stationary rolls. The shaft 28 is provided with a ClllVlIlg' pinion 29 which is in mesh with and driven by an idler pinion 30 mounted on a shaft 31, the idler pinion 30 being driven by pinion 17 with which it meshes. The shaft 28 is journalled in a swinging frame 32 which is preferably pivoted on shaft 31 between the bearings 31 on the stationary frame for said shaft. By reason of the fact that the frame is pivoted on shaft 31 on which the idler pinion 30 is mounted or concentrically therewith, when the frame is moved either upwardly 'oj r downwardly to adjust the movable roll H, the driving connection between the pinion 3G and the pinion 29 is maintained and the pinion 29 and roll H will be at all times positively driven. The swinging frame 32 has a head 33 provided with an opening or slot at which is adapted to receive a screw 35 which projects upwardly from the stationary frame of the machine. Preferably the screw 35 is stationarily secured and projects upwardly from the stationary frame of the machine and the top face of the head 33 is curved as indicated at 33. 37 indicates a nut or hand wheel which is provided with an internally threaded opening to work upon screw 35. This nut or wheel 37 constitutes a stop and limits upward swinging movement of the swinging frame by engaging with the head 33. In all adjustments of the swinging frame the curved top 36 of the head will bear against the nut 37 at diametrically opposite points thereon, so that in all adjustments of the frame and roll H. pressure upwardly on movable roll H will be exerted lengthwise of the screw and will not exert any lateral strain upon the screw. 38 indicates coil springs interposed between the stationary frame and the swinging frame and which force the swinging frame upwardly to maintain the roll H away from the two stationary rolls. The springs 38 are centered in position by means of lugs or pintles 39 and 40 projecting respectively from the swinging frame and from a part of the fixed frame of the machine. The coil springs normally tend to force the swinging frame upwardly and its movement in that direction is limited by the nut or wheel 37 engaging with the head 33 of the swinging frame. Therefore, adjustments of the space between the stationary rolls and the movable roll may be made by screwing the nut 37 upwardly or downwardly on the screw 35,

This movable roll is preferably. of.

thereby regulating the curvature of "the bends made.

a 41 and 4:2 designate guide rollers, one of these rollers being positioned in front of and the other behind the seven-011s and their function being to support and guide the bars or other members traveling through the machine and to prevent warping. ondi'stortion of them. The guide rollersarej ournalled in brackets as and e l, wliichbra'ckets are suitably pivoted 011 the stationary frame, as for example by stud shafts 45. and a6 which are secured in holes in the stationary frame so that the roller brackets are capable of turning about their pivotal connections in order that the rollers may assume positions relatively radial to the curvatures of the bars being bent in the machine,

In order to prevent lateral distortion of certain shapes of bars while they are being bentand as they leave the bending rolls, it is necessary that pressure be applied laterally against the bars or against the bar flanges as they passthrough the rolls. trated in Fig. 3 of the drawings, the normal positions of the guide rollers are suchthat the points on their peripheries on which the bars bear are in the same vertical plane as theouterfaces of the several fixed rolls or the inner edge of the flange of a bar passing through the rolls. However, in some cases it is necessary,in order to secure a true form or shape, to apply some lateral. pressure to provision of any complicated movable carriage or the like, for the guide rolls, unnecessary as well as undeslrable. The rollers are mountedvon eccentrlc bearings, 1n the preferred form illustrated, and as the rollers are mounted in like manner, only one roller mounting is described in detail. t? designates a shaft journalled in bracket 44- and provided with an eccentric or offset portion 48 on which the roller d2 turns. One end of shaft li is threaded as at 49 and formed with an angular or square end 50, affording a grip for turning the shaft to cause the roller to project more or less from the bracket. The shaft is maintained in any desired position by means of a nut 51 which engages the threaded end 49 of the shaft and bears against an end of the bracket, a bushing surrounding the shaft between this nut 51 and a shoulder 52 on the shaft and being pinned in the shaft opening in the bracket.

I claim as my invention:

'1. In a metal bending machine, the combination of a stationary frame, a pair of bending rolls having fixed axes in said stationary frame, means for driving said rolls,

As villus-' assen a frame mountedto swing above said rolls about a fixed pivotal axis, said swinging frame having a recessed head, a stationary screw secured to said stationary frame and entering the recess in the head, and a nut working on said screw and adapted to engage the head to limit the upward movement of said swinging frame, a bending roll journalled in said swinging frame, and drive gearing in positive driving connection with said driving means and said adjustable roll in all adjustments of said roll.

2. In a metal bending machine, the com bination of a stationary frame, a pair of bending rolls having fixed axes in said stationary frame, means for driving said rolls, a frame mounted to swing above said rolls about a fixed pivotal axis, said swinging frame having a recessed head provided with a rounded top portion, a stationary upwardly-projecting screw secured to said stationary frame and entering'the recess in the head, and a nut working on said screw and adapted to engage the head to limit the up ward movement of said swinging frame, a bending roll journalled in said swinging frame, and drive gearing in positive driving connection with said driving means and said adjustable roll in all adjustments of said roll. j

3. In a metal bending'machine, the combination of a stationary frame, a pair of bending rolls having fixed axes in said stationary frame, means for driving said rolls, a frame mounted to swing above said rolls about a fixed pivotal axis, springs for normally pressingsaid swinging frame upwardly, an adjustable bending roll journalled in said swinging frame to be moved towards and from first named rolls, releasable means for securing said adjustable roll in different positions above said first named rolls, and drive gearing in positive driving connection with. said driving means and said adjustable roll in all adjustments of said roll.

a. In a metal bending machine, the combination of a stationary frame, a pair of bending rolls having fixed axes in said stationary frame, means for driving said rolls, a shaft having a fixed axis in said station ary frame, an idler pinion mounted on said shaft, a pinion on one of the stationary roll shafts and meshing with said idler pinion, a frame pivoted to swing on said idler pinion shaft, an adjustable roll journalled in said swinging frame, a driving pinion connected to said adjustable roll and engaging said idler pinion, whereby said adjustable roll is maintained in driving connection with said stationary rolls while said swinging frame is swung on said idler pinion shaft.

5. In a metal bending machine, the combination with a pair of bending rolls having fixed axes, an adjustable roll mounted for adjustment towards and from said fixed rolls, means for driving said rolls, and uiding devices adapted to engage a side of a bar or the like passing'through said rolls, each of said guiding devices comprising a pivoted bracket and a roll eccentrically adjustable in said bracket.

6. in a metal bending machine, the combination with a pair of bending rolls having fixed axes, an adjustable roll mounted for adjustment towards and from said fixed rolls, means for driving said rolls, guiding devices adapted to engage a side ofa bar or the like passing through said rolls, each of said guiding devices comprising a pivoted bracket, a shaft rotatably adjustable in said bracket and having an eccentric portion, means for locking said shaft in different positions against rotation in said bracket, and a roller mounted on the eccentric portion of said shaft.

7. In a metal bending machine, the combination with a pair of bending rolls having fixed axes, an adjustable roll mounted for adjustment towards and from said fixed rolls, means for driving said rolls, and guiding devices adapted to engage a side of a bar or the like passing through said rolls, each of said guiding devices comprising a pivoted bracket, a shaft rotatably adjustable insaid bracket and having an eccentric portion be tween its bearing points, said shaft having a threaded end, a roller mounted to rotate on the eccentric portion of said shaft, said shaft having an angular portion atone end, and a nut engaging said threaded portion for locking the shaft against rotation.

S. in a metal bending machine, the 001m bination of a stationary frame, a pair of bending rolls havin fixed axes in said stationary frame, means for driving said rolls, a frame mounted to swing above said rolls about a fixed pivotal axis, an adjustable bending roll journalled in said swinging frame to be moved towards and from said first named rolls, releasable means for se curing said adjustable roll in different positions above said fixed rolls, projecting parts on the under side of said swinging frame, a pair of coil springs between said stationary frame and said swinging frame, the upper ends of said springs engaging said parts on said swingin frame, spring engaging means on the stationary frame, and drive gearing in positive driving connection with said drivin means and said adjustable roll in all adjustments of said roll GUSTAV H. ZIMMEB. 

